Reading this I got worried about the tinySA seeing ghosts so I took a SI5351 and set all outputs to 5MHz

A nice clean scan, except for the signal just above 8MHz which is probably a spur coming from the MCU in the tinySA
Then one of the unconnected outputs was set to 6MHz

Now various 1MHz spaced spurs appear
and with all outputs set to 6MHz

so the 1MHz spaced spikes seem to originate from the SI5351, or am I missing something and is there a big problem in the tinySA?